CONTENTS 



Preface v 



I. INTRODUCTION 1 



Classification of Plants 1 



Plant Life of the Past 4 



II. thallophyta: algae 7 



1. Cyanophyceae 8 



2. Euglenophyceae 14 



3. Chrysophyceae 16 



4. Dinophyceae 18 



5. Xanthophyceae 18 



6. Bacillariophyceae 21 



7. Chlorophyceae 25 



1. Volvocales 26 



2. Chlorococcales 32 



3. Ulotrichales 38 



4. Oedogoniales 45 



. 5. Conjugales 48 



6. Siphonocladiales 54 



7. Siphonales 57 



Summary of Chlorophyceae 61 



III. thallophyta: algae (continued) 63 



8. Charophyceae 63 



9. Phaeophyceae 66 



1. Ectocarpales 67 



2. Sphacelariales 69 



3. Cutleriales 70 



4. Dictyotales 72 



5. Laminariales 76 



6. Fucales 80 



Summary of Phaeophyceae 85 



10. Rhodophyceae 85 



Comparison of the Classes of Algae 93 



General Conclusions 94 



IV. thallophyta: fungi 100 



1. Schizomycetes 100 



2. Myxomycetes 104 



3. Phycomycetes 103 



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